Telephonic instrument



' witvmaaw W. P. STUNZ.

TELEPHONIC INSTRUMENT.

APPLICATION FILED JULY22. I915.

Patented Oct. 28, 1919.

3 SHEETSSHEET I.

W. P. STUNZ. v

TELEPHONIG INSTRUMENT. APPLICATION FILED JULY 22, 9]5.

1,31 9,933. I I7 5. .3 SHEETSQ-SHEET 2.

Patnted Oct. 2s,-1919.;;

W. P. STUNZ.

TELEPHO'NIC INSTRUMENT.

APPLICATION FILED JULY 22. 1915 1,319,933. Patented Oct. 28,1919.

3 SHEETS-SHEET 3- wit-macaw annual} UNITED STATES PATENT OFFICE.

WILLIAM PIRililfi'lON STUNZ, OF LANSDOWNE, MARYLAND, ASSIGNOR TO GEORGE REGESTER WEBB, 0F BALTIMORE, MARYLAND.

TELEPHONIC INSTRUMENT.

Specification of Letters Patent.

Patented Oct. 28, 1919.

application filed July 22, 1915. Serial No. 41,308.

To all whom it may concern:

.Be it known that I, WILLIAM PRESTON STUNz, a citizen of the United States, residing at Lansdowne, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Telephonic Instruments; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, references being had to the accompanying drawings, and to the letters and figures of reference marked thereon, whlch form a part of this specification.

My invention relates to telephone instruments. It has for its objects to repeat or multiply a varying or fluctuating current of low value, whetherproduccd by voice or mechanical means, impressed or imparted to the windings of 'electro-magnets which act as motor magnets to a battery of transmitter cells connected to another circuit which is actuated from the electro-magnets so as to efiect a reproduction of the original current having a higher working value, and which makes possible the supply of an efiicient current to a greater number of receivers or other instruments through the repeating or multiplying medium.

To the accomplishment of the foregoing and such other objects as may hereinafter appear the invention consists in the features hereinafter particularly described and then sought to be clearly defined by the claims, reference being had to the accompanying drawings forming a part thereof, and in which Figure l is a top plan View of the repeating instrument;

Fig. 2 a side elevation thereof;

Fig. 3 a rear end elevation;

Fig. 4 a front end elevation;

Fig. 5 a central vertical longitudinal section;

Fig. 6 a vertical longitudinal section through one group of transmitter cells;

Fig. 7 a cross section on the line 5-5 of Fig. 5;

Fig. 8 a detail view, enlarged scale, wlth parts in section, showing manner of supporting the front lever which reciprocates the electrode shafts;

:in section, of one of the electro-magnets with the other so as to move in unison, the

several cells of each bank or battery being connected in multiple to a suitable direct electric current supply, the cells of the two banks or batteries being connected with the current supply to form the arms of a Wheatstone bridge circuit. The several electrodes of one bank or battery are moved n the opposite direction to the correspondmg electrodes of the cells of the other battery or bank mechanically by power derived through electro-magnets having "like windings connected in multiple but in opposite polarity so. that the armature of one magnet is attracted while the armature of the other is repelled so that the power transmltted therefrom to the several electrodes of one battery of cells will cause them to move in the opposite direction to the electrodes ofthe other battery of cells thereby compressmg the granular carbon at one side of the electrodes in each battery or bank while releasing compression on the carbon granules on the other face of the electrodes 1n each battery or bank of cells so that during the reciprocation of the elertrodes there will be transmitted an undulatory current to the number of receivers or other instruments connected with the repeater composed of the banks of transmitter cells. The advantage of this form of repeater or multiplier is that the voice or other varying or fluctuating currents of relative low value derived from the voice or other transmitter and impressed onto the windings of the electro-magnets, which act as motor-magnets to the battery or bank of granular carbon cells of the repeater, convert the electrical energy of the magnet windings into mechanical energy by the banks of carbon cells which energy in turn is transmitted electrically to the receivers or other instruments, and this results in the consumption of the entire output of the first. transmitter and reproduction of the original circuit with a higher working value, and making possible the supply to a greater number of receivers or other in struments without diminution of current value.

In the preferred form of the instrument the repeater is formed of a number ofmetallic frames 1, preferably of the form illustrated in Fig. 7, having their faces formed with recesses to receive stationary electrodes 3 of suitable material, and spaced apart for the annular shells or rings +1 of suitable insulating material to form the walls of the series of cells 5 for the reception of granular carbon, and movable electrodes 2, constitute as many transmitters as there are cells, each row of cells constituting a battery or bank of cells. The several frames and the heads 6 are bound together by rods 7 and 8 which at their ends extend through bushings 9 of suitable insulating material and are provided with binding nuts 10. The rods where they pass through the framesare respectively encircled by insulating bushings 11 and 12 which also pass through spacing collars l3 and 11 respectively interposed between the frames. Insulating strips 15 are interposed between the frame members adjoining each other, and insulating strips 16 are interposed between each alternate frame and the adjoining collar 13 throughout the length of the rod 7, and also between each alternate frame and the adjoining collar 14 throughout thelength of the rod 8; and each alternate frame is connected with the rod 7 by a contact screw 17 and the remaining alternate frames connected by contact screws 18 with the rod 8 so that each companion pair of transmitter chambers or cells together with the conductors 19 and 20 leading respectively from the rods 7 and S to a source of direct current supply will form a VVheatstone bridge circuit.

Extending through the bank or battery of carbon cells so as t reciprocate, are rods 21 to which are attached the movable electrodes 2. At one end the rods are connected together by a horizontally disposed lever 22, of the first order, fulcrumed at 23, and the other ends of the rods are connected by insulated hinged: joints 24 .to depending arms or levers 25 hinged at points 26 to disks 27 secured by set screws 28 so as to be adjusted rotatably, and which may be guided in their swing by guides 29. The lever ends of these arms or levers are in contact with a horizontally disposed lever 30, at equal distances from the fulcrum thereof, said lever being fulcrumed upon a post 31 secured to a suitable support by adjusting screws 32 which permit adjustment of the lever to vary the distance between the cores of the electro-magnets and their armatures, and a lock screw 33 is provided for securely holding the fulcrum-post to its adjustment. The lever 30 is preferably of the form shown with a horizontal ledge to which is connected the armatures 35 disposed adjacent to the cores of their electro-magnets 3G, and the armatures are preferably but not of necessity provided each with a pin 37 fitting in a corresponding recess in the end of permanent magnets 38 so as to better support the armatures and permit them to' rock as attracted and repelled by the magnets. The lever 30 and air space between the armatures and cores of the electro-magnets are maintained in a state of balance by the aid of springs 39 in contact with opposite ends of the lever and adjustable by setscrews 10. As first one armature and then the other is attracted by its magnet, the lever 30 is rocked on its fulcrum and through the arms or levers 25 and horizontally rocking lever 22 will cause the movable electrodes in one battery of cells to move in one direction and the electrodes of the other battery to move in the opposite dlrection, and so on in alternation so long as the armatures are in alternation attracted and repelled. Thus the granular carbon in one set of cells will be compressed and pressure'on the carbon of the corresponding cells in the other battery or bank will be relieved from pressure, and the cells of one battery being connected with those of the other battery to form a WVheatstone bridge circuit as previously described, a current'is transmitted to line and to the receivers or other instruments connected therewith which has a multipled or high working value relatively to the voice or other fluctuating current of low value derived from the first or voice transmitting instrument.

The electron1agnets 36 have like windings 41 and 42 and are connected in multiple but in opposite polarity so as to cause the armature of one to be attracted While the other is repelled and thus cause the lever 30 to oscillate on its fulcrum, said windings leading from a well known type of voice or other transmitting device illustrated constructed on the Wheatstone bridge principle which receives its current from a source of direct current supply.

The magnetic field of the magnet windings is augmented by a permanent magnet 38, one being shown for each electro-magnet, the polarity of the permanent magnets being so disposed, as illustrated, to add to the strength of the windings of the respective electro-magnets. The electrode shafts 21 have the electrical conductors 43 leading therefrom to the receivers or other instruments to be operated, and as previously stated the several transmitter cells of the two batteries or banks of the repeater transmitters are connected by the conductors 19 and 20 respectively with a source of direct current sup ly. In Fig. 11 of the drawing is given a iagrammatie illustratlon of the connection ofthe movable electrode shafts to a receiver, and the connection of the stationary electrodes of the groups of cells with the source of current supply.

I have illustrated and described the preferred details of construction of the 'seyera] parts but changes can be made therein without departing from the essentials as sought to be defined by the appended claims.

-Having described my invention and set forth its merits What I claim is:

1. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft with the other so that as the electrodes of one group are moved in one direction those of the other group will be moved in the opposite direction, the compression side of one group being of opposite polarity to that of the other group, and means for moving the shafts in alternation in one direction.

2. In a telephonic instrument, a battery of gron ed transmitter cells each containing a mova le electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, electrical current conductors connecting cells of the two groups to form a Wheatstone bridge circuit, means connecting one shaft with the other so that as the electrodes of one group are moved in one direction those of the other group will be moved in the opposite direction, the compression side of one group being of opposite polarity to that of the other group, and means for moving the shafts in alternation in one direction.

3. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extend? ing through the cells of each group and having electrodes of the group connected to it, electrical current conductors connecting the transmitter cells of the groups in multiple to a source of current supply, the cells of one group being connected with the cells of the other group to form a Wheatstone bridge circuit, means connecting one shaft with the other so that as the electrodes of one group are moved in one direction those of the other group will be moved in the opposite direction, the compression side of one group being of opposite polarity to that of the other group, and means for moving the shafts in alternation in one direction.

4. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft with the other so that as the electrodes of one group are movedin one direction those of the other group will be moved in the opposite direction, and electro-magnetic means constituting motive power for moving the shafts of the transmitter cells.

5. In a telephonic instrument, a battery of grouped transmitter cells-each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft with the other so that as the electrodes of one group are moved in one direction those of the other group will be moved in the opposite direction, electromagnets constituting motive power for moving the shafts of the transmitter cells, and permanent magnets disposed to augment the magnetic field of the electro-magnets.

6. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft with the other so that as the electrodes of one group are moved in one direetion those of the other group will be moved in the opposite direction, a lever operatively related to the shafts of the transmitter cells, and electro-magnets connected in multiple and in opposite polarity to cause one to exert an attracting and the other a repelling influence upon the lever to reciprocate the shafts of the transmitter cells.

7. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft to the other to cause the elcctrodes of one group to move in the opposite direction to those of the other group, swinging arms connected to the electrode shafts, a lever with which the arms engage, electroma nets of opposite polarity, connected in mu tiple, and armatures for the magnets connected with said lever to oscillate the same to swing the hinged arms to reciprocate the electrode shafts. v

8. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft with the other to cause the electrodes of one group to move in the opposite direction to those of the other group, a

lever operatively connected with the shafts, electro-magnets of opposite polarity, connected in multiple, armatures spaced from the magnets to leave air spaces between the armatures and cores of the magnets, said arms being connected With said lever, and means for adjusting the lever and armatures relatively to the magnets.

9. In a telephonic instrument, a battery of grouped transmitter cells each containing a movable electrode, a shaft extending through the cells of each group and having electrodes of the group connected to it, means connecting one shaft with the other to cause the electrodes of one group to move in the opposite direction to those of the other group, a lever operatively connected with the shafts, means to oscillate the lever to reciprocate the electrode shafts, and adjusting springs for balancing the lever.

In testimony whereof I atfix my signature in presence of two Witnesses.

WILLIAM PRESTON STUNZ.

Witnesses:

HENRY M. Bonn, ROBERT B. GREEN. 

